3rd Grade Math Unit 4
Longview ISD
3rd Grade TEKS with Specificities
3.9C identify lines of symmetry in twoGeometry and spatial reasoning.
dimensional geometric figures
The student used formal geometric
vocabulary. The student is expected Include:
to:
 Given any two-dimensional geometric
-identify, classify, and describe two-and
figures, determine all lines of symmetry
three-dimensional geometric figures by
 Journal writing (create
their attributes. The student compares
definitions/attributes)
two-dimensional figures, three-dimensional  Use pictorial representations on
figures, or both by their attributes using
geoboard grid paper
formal geometric vocabulary.
 Use real life applications
Include:
Vocabulary
Two dimensional figures
horizontal, diagonal, vertical, symmetrical
 Vertices and sides
Helpful manipulatives:
Three-dimensional figures
 Tangrams
 Vertices, edges and faces
 Pattern blocks
Two dimensional vocabulary (circle,
 Geoboards
polygon, triangle, square, rectangle,
quadrilateral, rhombus, trapezoid,
Unit 4 Geometry
parallelogram, pentagon, hexagon,
octagon, side, vertex)
Vocabulary Adventure
Helpful manipulatives:
 Geometry Jungle pp. 65-113
 Pattern blocks, tangrams, every day
Vocabulary is a critical component of
items
geometry. Use these pages along with
 Three-dimensional vocabulary
hands-on lessons with 2-D and 3-D figures.
(sphere, cone, cylinder, cube,
rectangular prism, triangular prism,
Investigations
square pyramid, triangular, pyramid,
Turtle Paths Student Sheet 11, 12, and
vertex, edge, face)
13 (triangles)
Helpful manipulatives:
 3-D geometric shapes
Exploring Solids and Boxes
Investigation 1 “Sorting and Describing”
3.9 Geometry and spatial reasoning.
 Session 1 “Sorting Polyhedra”
The student recognizes congruence
 Session 2 “ What’s My Shape?”
and symmetry. The student is
Investigation 2 “Building Polygons”
expected to:
 Session 1-2 “Building Polygons”
3.9A identify congruent two-dimensional
 Session 4-5 “Building Polyhedra From
figures
Descriptions”
Include:
 Journal writing (create definitions of two- Mathematical Thinking at Grade 3
dimensional figures using attributes)
Investigation 2 “Doubles and Halves”
 Concrete examples
 Session 1 “Pattern Blocks”
 Pictorial representations
 Session 3-4 “Finding Doubles and
 Real world application
Halves”
Two-dimensional vocabulary (circle,
polygon, triangle, square, rectangle,
Flips, Turns, and Area (Note: Although
quadrilateral, rhombus, trapezoid,
transformations is not part of 3rd grade
parallelogram, pentagon, hexagon,
TEKS, congruence and symmetry are the
octagon, side, vertex)
foundations for those movements.
Helpful manipulatives:
Rotations, reflections, and translations
Pattern blocks, tangrams
should not be the focus of this lesson;
however, correct vocabulary should be
3.9B create two-dimensional figures
used.)
with lines of symmetry using
Investigation 1 “Motions with Tetrominoes”
concrete models and technology
 Session 1 “Tetrominoe”
Investigation 2 “Finding Area”
Include:
 Session 2-3 “A Poster of 4 Unit Shapes”
 Create 2 dimensional figures and show
all lines of symmetry
 Given the number of lines of symmetry,
create the figure
 Journal writing-create definitions using
attributes
 Pictorial representations on geoboard
grid paper
 Use real-life applications
Helpful manipulatives:
 Tangrams, mirrors, geoboards, pattern
blocks
Vocabulary:
horizontal, diagonal, vertical, symmetrical
3.8
8/27/2007
Math Essentials
Pages 69-80
Measuring Up
Chapter 9 Geometry and Spatial Reasoning
Math Learning Center
Teacher Reference Manual Chapter 11
Geometry pp. 86-94
Volume 1—Contact
Lesson 17 “Apple Symmetry”
Lesson 26-27 “Symmetry”
Lesson 36 “Football” (rectangles)
Lessons 50-53 “Shapes”
Lesson 54 “Solids”
Lessons 61-62 “Congruence/Paper Folding”
Lesson 91 “Spatial Visualization” (rectangles in
empty boxes)
Volume 2—Contact
Lesson 154 “Solid Shapes” (real world)
Volume 3
Lesson 16 “Congruence & Area” (geo-boards)
Lesson 37 “Reflective and Rotational
Symmetry”
Lesson 42 “Pattern Block Explorations”
(reflective and rotational symmetry)
Lesson 49 “Geoboard Shapes”
TEXTEAMS (Geometry section)
 Alphabet Symmetry
 Geoboard Activities (polygons, symmetry,
congruence)
 Paper Folding Pinwheels
 Reflect It
 Wax Paper Transformations
 Symmetry with Tiles
 Lines of Symmetry (polygons)
 Oh No! My Ominoes!
 Tangram Geometry
 Polyhedron Discoveries (good student
recording sheet)
 Scavenger Shape Hunt
 Geo-shape Grab Bag
Problem Solving Strategies
“Find a Pattern”
Count On It pp. 34-37
Measuring Up Lesson 8
Problem Solver II
 #14 pp. 28-29
 #57 p. 96
 #58 p. 97
 #59 p. 98
Also appropriate for geometry
 #23 pp. 46-47
 #24 pp. 48-49
 #25 pp. 50-51 (This one uses the term
“diamond”; be sure students know the
geometrical term is “parallelogram”.)
 #72 p. 111
 #73 p. 112
 #74 p. 113
 #75 p. 114
Notes:
DRAFT 3